A bin to store your endmill boxes. The included Fusion file is parametric so you can control the number of rows and columns. 

There is also 50mm spaced mounting holes in the back, designed for M3 threaded inserts. I used them to mount some printable DIN rail hooks, but you could use whatever you wanted. 

The general idea here is to keep the tool-boxes that come with your endmills at hand, and labeled in a way you can put the tools back when you break them down. Each pocket has a small slot to include a label as well. 

For the DIN mount, I used this model: https://www.printables.com/model/600101-psu-din-mount